Division

United Kingdom

BAT-associated emission levels: See Table 9, Table 10 and Table 11.

Table 9

BAT-associated emission levels for NO_X emissions to air from a gas turbine

Parameter	Type of equipment	BAT-AEL^f1(monthly average)mg/Nm³ at 15 % O₂
BAT-AEL refers to combined emissions from the gas turbine and the supplementary firing recovery boiler, where present.
For fuel with high H₂ content (i.e. above 10 %), the upper end of the range is 75 mg/Nm³.
NO_X expressed as NO₂	Gas turbine (including combined cycle gas turbine — CCGT) and integrated gasification combined cycle turbine (IGCC))	40-120 (existing turbine)
NO_X expressed as NO₂		20-50 (new turbine)^f2

The associated monitoring is in BAT 4.

Table 10

BAT-associated emission levels for NO_X emissions to air from a gas-fired combustion unit, with the exception of gas turbines

For an existing unit using high air pre-heat (i.e. > 200 °C) or with H₂ content in the fuel gas higher than 50 %, the upper end of the BAT-AEL range is 200 mg/Nm³.
Parameter	Type of combustion	BAT-AEL(monthly average)mg/Nm³
NO_X expressed as NO₂	Gas firing	30-150 for existing unit^f3
30-100 for new unit

For an existing unit using high air pre-heat (i.e. > 200 °C) or with H₂ content in the fuel gas higher than 50 %, the upper end of the BAT-AEL range is 200 mg/Nm³.

Parameter

Type of combustion

BAT-AEL(monthly average)mg/Nm³

NO_X expressed as NO₂

Gas firing

30-150

for existing unit^f3

30-100

for new unit

The associated monitoring is in BAT 4.

Table 11

BAT-associated emission levels for NO_X emissions to air from a multi-fuel fired combustion unit with the exception of gas turbines

For existing units < 100 MW firing fuel oil with a nitrogen content higher than 0,5 % (w/w) or with liquid firing > 50 % or using air preheating, values up to 450 mg/Nm³ may occur.
The lower end of the range can be achieved by using the SCR technique.
Parameter	Type of combustion	BAT-AEL(monthly average)mg/Nm³
NO_X expressed as NO₂	Multi-fuel fired combustion unit	30-300 for existing unit^f4 ^f5

For existing units < 100 MW firing fuel oil with a nitrogen content higher than 0,5 % (w/w) or with liquid firing > 50 % or using air preheating, values up to 450 mg/Nm³ may occur.

The lower end of the range can be achieved by using the SCR technique.

Parameter

Type of combustion

BAT-AEL(monthly average)mg/Nm³

NO_X expressed as NO₂

Multi-fuel fired combustion unit

30-300

for existing unit^f4 ^f5

The associated monitoring is in BAT 4.

Annotations

Footnotes

f1: BAT-AEL refers to combined emissions from the gas turbine and the supplementary firing recovery boiler, where present.
f2: For fuel with high H₂ content (i.e. above 10 %), the upper end of the range is 75 mg/Nm³.
f3: For an existing unit using high air pre-heat (i.e. > 200 °C) or with H₂ content in the fuel gas higher than 50 %, the upper end of the BAT-AEL range is 200 mg/Nm³.
f4: For existing units < 100 MW firing fuel oil with a nitrogen content higher than 0,5 % (w/w) or with liquid firing > 50 % or using air preheating, values up to 450 mg/Nm³ may occur.
f5: The lower end of the range can be achieved by using the SCR technique.